Ultra Rat Zapper Ideal for catching and killing large rats, but works as a mouse trap as well Humane, high voltage shock kills rodent Easy to use - insert batteries, bait, place, turn it on, and relax, One set of 4 "D" batteries = 60 kills Hands-free "no touch, no view" disposal reduces the "yuck" factor of a common mouse and rat trap Note: This product is for indoor use only.